A process for the preparation of
4-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-butyl]-.alpha.,.a
lpha.-dimethylbenzeneacetic acid (Fexofenadine) of formula
##STR1##
Um processo para a preparação de 4-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-butyl]-.alpha., ácido de.a lpha.-dimethylbenzeneacetic (Fexofenadine) do ## do ## STR1 da fórmula